Time in Boulder, United States

Time zone: MDT (UTC/GMT -06:00) — America/Denver

Local time here is MDT, which sits 6 hours behind UTC, written UTC-06:00. The canonical zone name is America/Denver, and that is what to pick from a time zone dropdown.

One date to watch: Sunday, 01 November 2026. That is when Boulder goes back 1 hour onto MST — recurring meetings set before then will land an hour out unless the calendar handles zones properly.

Bear in mind United States spans 10 zones across the 419 cities we cover — checking a second city in the same country is often necessary.

Boulder has roughly 107,349 residents and ranks 191st by population among the United States cities on this site.

Read this as: relative to each city below, Boulder is the stated amount ahead or behind, right now.

Assuming a 09:00–17:00 day at both ends, these windows (in Boulder local time) fall inside working hours for both cities.

No shared working window exists with Paris, Dubai, Mumbai or Shanghai, so those calls have to sit outside somebody's normal hours.

These United States cities also use America/Denver, so their clocks read identically to Boulder at every moment of the year.

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